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kexec is a system call that enables you to load and boot into anotherkernel from the currently running kernel. kexec performs the functionof the boot loader from within the kernel. The primary differencebetween a standard system boot and a kexec boot is that the hardwareinitialization normally performed by the BIOS or firmware (depending onarchitecture) is not performed during a kexec boot. This has the effectof reducing the time required for a reboot.

Make sure you have selected CONFIG_KEXEC=y when configuring the kernel.The CONFIG_KEXEC option enables the kexec system call.